People are organic. We are the product of biology. Transhumans might have the option of not being so. They might be able to decide how much human would remain in the trans-human mix.
If you were in the position to decide, how much humanity would you keep? Would you elect to sleep? Eat? Excrete?
And what of sex? It is pure pleasure, but it is also the most biological of all biological functions.
Would you keep it?